From patchwork Wed Feb 23 14:55:42 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jacopo Mondi X-Patchwork-Id: 12757029 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1E975C433F5 for ; Wed, 23 Feb 2022 14:56:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241808AbiBWO5F (ORCPT ); Wed, 23 Feb 2022 09:57:05 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48216 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241807AbiBWO5D (ORCPT ); Wed, 23 Feb 2022 09:57:03 -0500 Received: from relay12.mail.gandi.net (relay12.mail.gandi.net [217.70.178.232]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B0D0211167 for ; Wed, 23 Feb 2022 06:56:33 -0800 (PST) Received: (Authenticated sender: jacopo@jmondi.org) by mail.gandi.net (Postfix) with ESMTPSA id 0E725200005; Wed, 23 Feb 2022 14:56:28 +0000 (UTC) From: Jacopo Mondi To: Steve Longerbeam Cc: Jacopo Mondi , laurent.pinchart@ideasonboard.com, sakari.ailus@iki.fi, hverkuil-cisco@xs4all.nl, mirela.rabulea@nxp.com, xavier.roumegue@oss.nxp.com, tomi.valkeinen@ideasonboard.com, hugues.fruchet@st.com, prabhakar.mahadev-lad.rj@bp.renesas.com, aford173@gmail.com, festevam@gmail.com, Eugen.Hristev@microchip.com, jbrunet@baylibre.com, paul.elder@ideasonboard.com, Mauro Carvalho Chehab , linux-media@vger.kernel.org Subject: [PATCH v4 06/27] media: ov5640: Update pixel_rate and link_freq Date: Wed, 23 Feb 2022 15:55:42 +0100 Message-Id: <20220223145603.121603-7-jacopo@jmondi.org> X-Mailer: git-send-email 2.35.0 In-Reply-To: <20220223145603.121603-1-jacopo@jmondi.org> References: <20220223145603.121603-1-jacopo@jmondi.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org After having set a new format re-calculate the pixel_rate and link_freq control values and update them when in MIPI mode. Take into account the limitation of the link frequency having to be strictly smaller than 1GHz when computing the desired link_freq, and adjust the resulting pixel_rate acounting for the clock tree configuration. Signed-off-by: Jacopo Mondi Reviewed-by: Laurent Pinchart --- drivers/media/i2c/ov5640.c | 66 ++++++++++++++++++++++++++++++++++++-- 1 file changed, 64 insertions(+), 2 deletions(-) diff --git a/drivers/media/i2c/ov5640.c b/drivers/media/i2c/ov5640.c index b1a282f453e3..17ad815f7bdf 100644 --- a/drivers/media/i2c/ov5640.c +++ b/drivers/media/i2c/ov5640.c @@ -31,6 +31,8 @@ #define OV5640_DEFAULT_SLAVE_ID 0x3c +#define OV5640_LINK_RATE_MAX 490000000U + #define OV5640_REG_SYS_RESET02 0x3002 #define OV5640_REG_SYS_CLOCK_ENABLE02 0x3006 #define OV5640_REG_SYS_CTRL0 0x3008 @@ -2412,6 +2414,66 @@ static int ov5640_try_fmt_internal(struct v4l2_subdev *sd, return 0; } +static int ov5640_update_pixel_rate(struct ov5640_dev *sensor) +{ + const struct ov5640_mode_info *mode = sensor->current_mode; + struct v4l2_mbus_framefmt *fmt = &sensor->fmt; + enum ov5640_pixel_rate_id pixel_rate_id = mode->pixel_rate; + unsigned int i = 0; + u32 pixel_rate; + s64 link_freq; + u32 num_lanes; + u32 bpp; + + /* + * Update the pixel rate control value. + * + * For DVP mode, maintain the pixel rate calculation using fixed FPS. + */ + if (!ov5640_is_csi2(sensor)) { + __v4l2_ctrl_s_ctrl_int64(sensor->ctrls.pixel_rate, + ov5640_calc_pixel_rate(sensor)); + + return 0; + } + + /* + * The MIPI CSI-2 link frequency should comply with the CSI-2 + * specification and be lower than 1GHz. + * + * Start from the suggested pixel_rate for the current mode and + * progressively slow it down if it exceeds 1GHz. + */ + num_lanes = sensor->ep.bus.mipi_csi2.num_data_lanes; + bpp = ov5640_code_to_bpp(fmt->code); + do { + pixel_rate = ov5640_pixel_rates[pixel_rate_id]; + link_freq = pixel_rate * bpp / (2 * num_lanes); + } while (link_freq >= 1000000000U && + ++pixel_rate_id < OV5640_NUM_PIXEL_RATES); + + /* + * Higher link rates require the clock tree to be programmed with + * 'mipi_div' = 1; this has the effect of halving the actual output + * pixel rate in the MIPI domain. + * + * Adjust the pixel rate control value to report it correctly to + * userspace. + */ + if (link_freq > OV5640_LINK_RATE_MAX) + pixel_rate /= 2; + + for (i = 0; i < ARRAY_SIZE(ov5640_csi2_link_freqs); ++i) { + if (ov5640_csi2_link_freqs[i] == link_freq) + break; + } + + __v4l2_ctrl_s_ctrl_int64(sensor->ctrls.pixel_rate, pixel_rate); + __v4l2_ctrl_s_ctrl(sensor->ctrls.link_freq, i); + + return 0; +} + static int ov5640_set_fmt(struct v4l2_subdev *sd, struct v4l2_subdev_state *sd_state, struct v4l2_subdev_format *format) @@ -2451,8 +2513,8 @@ static int ov5640_set_fmt(struct v4l2_subdev *sd, /* update format even if code is unchanged, resolution might change */ sensor->fmt = *mbus_fmt; - __v4l2_ctrl_s_ctrl_int64(sensor->ctrls.pixel_rate, - ov5640_calc_pixel_rate(sensor)); + ov5640_update_pixel_rate(sensor); + out: mutex_unlock(&sensor->lock); return ret;